1 // SPDX-License-Identifier: GPL-2.0
3  * USB-ACPI glue code
8 #include <linux/usb.h>
14 #include <linux/usb/hcd.h>
16 #include "hub.h"
19  * usb_acpi_power_manageable - check whether usb port has
21  * @hdev: USB device belonging to the usb hub
41  * usb_acpi_set_power_state - control usb port's power via acpi power
43  * @hdev: USB device belonging to the usb hub
47  * Notice to use usb_acpi_power_manageable() to check whether the usb port
54 	struct usb_hub *hub = usb_hub_to_struct_hub(hdev);  in usb_acpi_set_power_state()  local
59 	int error = -EINVAL;  in usb_acpi_set_power_state()
61 	if (!hub)  in usb_acpi_set_power_state()
62 		return -ENODEV;  in usb_acpi_set_power_state()
63 	port_dev = hub->ports[port1 - 1];  in usb_acpi_set_power_state()
76 		dev_dbg(&port_dev->dev, "acpi: power was set to %d\n", enable);  in usb_acpi_set_power_state()
78 		dev_dbg(&port_dev->dev, "acpi: power failed to be set\n");  in usb_acpi_set_power_state()
93 	 * According to 9.14 in ACPI Spec 6.2. _PLD indicates whether usb port  in usb_acpi_get_connect_type()
96 	 * and disconnected with USB devices. If no visible and connectable,  in usb_acpi_get_connect_type()
97 	 * a usb device is directly hard-wired to the port. If no visible and  in usb_acpi_get_connect_type()
105 	if (!upc || (upc->type != ACPI_TYPE_PACKAGE) || upc->package.count != 4)  in usb_acpi_get_connect_type()
108 	if (upc->package.elements[0].integer.value)  in usb_acpi_get_connect_type()
109 		if (pld->user_visible)  in usb_acpi_get_connect_type()
113 	else if (!pld->user_visible)  in usb_acpi_get_connect_type()
122  * Private to usb-acpi, all the core needs to know is that
123  * port_dev->location is non-zero when it has been set by the firmware.
135 	/* Get the struct usb_device point of port's hub */  in usb_acpi_get_companion_for_port()
136 	udev = to_usb_device(port_dev->dev.parent->parent);  in usb_acpi_get_companion_for_port()
139 	 * The root hub ports' parent is the root hub. The non-root-hub  in usb_acpi_get_companion_for_port()
140 	 * ports' parent is the parent hub port which the hub is  in usb_acpi_get_companion_for_port()
143 	if (!udev->parent) {  in usb_acpi_get_companion_for_port()
144 		adev = ACPI_COMPANION(&udev->dev);  in usb_acpi_get_companion_for_port()
145 		port1 = usb_hcd_find_raw_port_number(bus_to_hcd(udev->bus),  in usb_acpi_get_companion_for_port()
146 						     port_dev->portnum);  in usb_acpi_get_companion_for_port()
148 		parent_handle = usb_get_hub_port_acpi_handle(udev->parent,  in usb_acpi_get_companion_for_port()
149 							     udev->portnum);  in usb_acpi_get_companion_for_port()
154 		port1 = port_dev->portnum;  in usb_acpi_get_companion_for_port()
172 	handle = adev->handle;  in usb_acpi_find_companion_for_port()
175 		port_dev->location = USB_ACPI_LOCATION_VALID  in usb_acpi_find_companion_for_port()
176 			| pld->group_token << 8 | pld->group_position;  in usb_acpi_find_companion_for_port()
177 		port_dev->connect_type = usb_acpi_get_connect_type(handle, pld);  in usb_acpi_find_companion_for_port()
189 	struct usb_hub *hub;  in usb_acpi_find_companion_for_device()  local
191 	if (!udev->parent) {  in usb_acpi_find_companion_for_device()
193 		 * root hub is only child (_ADR=0) under its parent, the HC.  in usb_acpi_find_companion_for_device()
196 		adev = ACPI_COMPANION(udev->bus->sysdev);  in usb_acpi_find_companion_for_device()
200 	hub = usb_hub_to_struct_hub(udev->parent);  in usb_acpi_find_companion_for_device()
201 	if (!hub)  in usb_acpi_find_companion_for_device()
205 	 * This is an embedded USB device connected to a port and such  in usb_acpi_find_companion_for_device()
208 	port_dev = hub->ports[udev->portnum - 1];  in usb_acpi_find_companion_for_device()
215 	 * The USB hierarchy like following:  in usb_acpi_find_companion()
226 	 * where HUBN is root hub, and PRNN are USB ports and devices  in usb_acpi_find_companion()
228 	 * connected composite USB devices. PRNN and FNNN may contain  in usb_acpi_find_companion()
232 	 * On the kernel side both root hub and embedded USB devices are  in usb_acpi_find_companion()
240 	 * devices corresponding to USB interfaces.  in usb_acpi_find_companion()
256 	.name = "USB",